forked from omniscale/imposm3
-
Notifications
You must be signed in to change notification settings - Fork 0
/
parser.go
189 lines (175 loc) · 3.59 KB
/
parser.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
package parser
import (
"compress/gzip"
"encoding/xml"
"imposm3/element"
"imposm3/logging"
"os"
"strconv"
)
var log = logging.NewLogger("osc parser")
type DiffElem struct {
Add bool
Mod bool
Del bool
Node *element.Node
Way *element.Way
Rel *element.Relation
}
func Parse(diff string) (chan DiffElem, chan error) {
elems := make(chan DiffElem)
errc := make(chan error)
go parse(diff, elems, errc)
return elems, errc
}
func parse(diff string, elems chan DiffElem, errc chan error) {
defer close(elems)
defer close(errc)
file, err := os.Open(diff)
if err != nil {
errc <- err
return
}
defer file.Close()
reader, err := gzip.NewReader(file)
if err != nil {
errc <- err
return
}
decoder := xml.NewDecoder(reader)
add := false
mod := false
del := false
tags := make(map[string]string)
newElem := false
node := &element.Node{}
way := &element.Way{}
rel := &element.Relation{}
NextToken:
for {
token, err := decoder.Token()
if err != nil {
errc <- err
return
}
switch tok := token.(type) {
case xml.StartElement:
switch tok.Name.Local {
case "create":
add = true
mod = false
del = false
case "modify":
add = true
mod = true
del = true
case "delete":
add = false
mod = false
del = true
case "node":
for _, attr := range tok.Attr {
switch attr.Name.Local {
case "id":
node.Id, _ = strconv.ParseInt(attr.Value, 10, 64)
case "lat":
node.Lat, _ = strconv.ParseFloat(attr.Value, 64)
case "lon":
node.Long, _ = strconv.ParseFloat(attr.Value, 64)
}
}
case "way":
for _, attr := range tok.Attr {
if attr.Name.Local == "id" {
way.Id, _ = strconv.ParseInt(attr.Value, 10, 64)
}
}
case "relation":
for _, attr := range tok.Attr {
if attr.Name.Local == "id" {
rel.Id, _ = strconv.ParseInt(attr.Value, 10, 64)
}
}
case "nd":
for _, attr := range tok.Attr {
if attr.Name.Local == "ref" {
ref, _ := strconv.ParseInt(attr.Value, 10, 64)
way.Refs = append(way.Refs, ref)
}
}
case "member":
member := element.Member{}
for _, attr := range tok.Attr {
switch attr.Name.Local {
case "type":
var ok bool
member.Type, ok = element.MemberTypeValues[attr.Value]
if !ok {
// ignore unknown member types
continue NextToken
}
case "role":
member.Role = attr.Value
case "ref":
var err error
member.Id, err = strconv.ParseInt(attr.Value, 10, 64)
if err != nil {
// ignore invalid ref
continue NextToken
}
}
}
rel.Members = append(rel.Members, member)
case "tag":
var k, v string
for _, attr := range tok.Attr {
if attr.Name.Local == "k" {
k = attr.Value
} else if attr.Name.Local == "v" {
v = attr.Value
}
}
tags[k] = v
case "osmChange":
// pass
default:
log.Warn("unhandled XML tag ", tok.Name.Local, " in OSC")
}
case xml.EndElement:
var e DiffElem
switch tok.Name.Local {
case "node":
if len(tags) > 0 {
node.Tags = tags
}
e.Node = node
node = &element.Node{}
newElem = true
case "way":
if len(tags) > 0 {
way.Tags = tags
}
e.Way = way
way = &element.Way{}
newElem = true
case "relation":
if len(tags) > 0 {
rel.Tags = tags
}
e.Rel = rel
rel = &element.Relation{}
newElem = true
}
if newElem {
e.Add = add
e.Del = del
e.Mod = mod
if len(tags) > 0 {
tags = make(map[string]string)
}
newElem = false
elems <- e
}
}
}
}